When someone thinks they're good/the best at a game when they are really just a noob. They will continue to argue with you, trying to explain how they are better without any proof. When you end up beating them/doing better than them they will still continue to make excuses as to how they are better.

Nikko: I don't understand how you're beating me, I'm better than you at this game!
Mikey: It's all good you're in noob denial
Nikko: Nope you just got lucky lets play again